Two Ways to Simulate Stained Glass
Translucent pieces of colored tissue paper look like glass when "mod podge-d" (glued) to a transparent surface (such as acrylic or transparency sheets). Get the "high gloss" mod podge so that the dried tissue looks shiny. You can glue black strips of paper to simulate "leading" if you want.
Use this idea to create a "Fiery Furnace" Stained Glass encouragement.
Member Wendy wrote this stained glass idea which uses LIQUID LEADING and says you don't need to wait for it to dry before applying paint. Suggest you blow dry the liquid leading ("ready leading") a bit to get it to set up, then use an EYE DROPPER to drop color into the different sections instead of brushing (brushing will disturb the not yet set up leading).